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libata: Add helper to determine when PHY events should be ignored

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This is a preparation commit that will allow to add other criteria
according to which PHY events should be dropped.

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Gabriele Mazzotta 2015-04-25 19:52:36 +02:00 committed by Tejun Heo
parent e0e2674b92
commit 8393b811f3
3 changed files with 21 additions and 2 deletions
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3
drivers/ata/libahci.c
View File

@ -1707,8 +1707,7 @@ static void ahci_handle_port_interrupt(struct ata_port *ap,
if (unlikely(resetting))
status &= ~PORT_IRQ_BAD_PMP;
/* if LPM is enabled, PHYRDY doesn't mean anything */
if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
if (sata_lpm_ignore_phy_events(&ap->link)) {
status &= ~PORT_IRQ_PHYRDY;
ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
}

19
drivers/ata/libata-core.c
View File

@ -6752,6 +6752,25 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
return tmp;
}
/**
* sata_lpm_ignore_phy_events - test if PHY event should be ignored
* @link: Link receiving the event
*
* Test whether the received PHY event has to be ignored or not.
*
* LOCKING:
* None:
*
* RETURNS:
* True if the event has to be ignored.
*/
bool sata_lpm_ignore_phy_events(struct ata_link *link)
{
/* if LPM is enabled, PHYRDY doesn't mean anything */
return !!(link->lpm_policy > ATA_LPM_MAX_POWER);
}
EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
/*
* Dummy port_ops
*/

1
include/linux/libata.h
View File

@ -1201,6 +1201,7 @@ extern struct ata_device *ata_dev_pair(struct ata_device *adev);
extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);
extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap, struct list_head *eh_q);
extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
extern int ata_cable_40wire(struct ata_port *ap);
extern int ata_cable_80wire(struct ata_port *ap);